Other Parts Discussed in Thread: TPS61006
Hello,
I'm playing around with a 0.9V version (TPS3839A09DBZR) to be used as a reset circutry for TPS61006 step-up to prevent lock-ups.
I used a 100nF decoupling cap as recommended and reset pin is directly connected to enable pin of step-up.
Initially it behaves almost as it should, it goes into restart when voltage on its VDD is around 1V (100mv more then it should) but hysteresis is around 200-300mV. It needs around 1.2V-1.3V on VDD to stop asserting restart.
I tried TPS3839G12DBZR (1.1V) version too and again the same problem hysteresis was around 200-300mV, reset was deasserting around 1.4V. I tried two totally different laboratory power supplies, and two different multimeters to be sure.
I'm using them as a bodge on other side of PCB close to step-up IC, but there are no long wires or anything which I would think could cause any issues, also all the voltages are measured directly on pins, and they were stable for minutes (I checked with oscilloscope to make sure there isnt any nasty ripple)
Is there anybody who has some idea about where to look?
Thank you.
